<template>
	<view class="chat">
		<!-- 顶部标题 -->
		<view class="topTabbar">
			<!-- 返回图标 -->
			<uni-icons class="icon" type="arrow-left" size="20px" color="#000" @click="goback()">
			</uni-icons>
			<uni-badge v-if="cnt>=1" class="uni-badge-left-margin" :text="cnt" />
			<!-- 标题 -->
			<view class="text">{{groupInfo.groupName}}</view>
		</view>
		<scroll-view :style="{height: `${windowHeight-inputHeight - 180}rpx`}" id="scrollview" scroll-y="true"
			:scroll-top="scrollTop" class="scroll-view">
			<!-- 聊天主体 -->
			<view id="msglistview" class="chat-body">
				<!-- 聊天记录 -->
				<view v-for="(item,index) in msgList" :key="index">
					<!-- 自己发的消息 -->
					<view class="item self" v-if="item.send">
						<!-- 文字内容 -->
						<view class="content right">
							{{item.msgContent}}
						</view>
						<!-- 头像 -->
						<image class="avatar" :src="item.image">
							{{item.senderName}}
						</image>
					</view>
					<!-- 机器人发的消息 -->
					<view class="item Ai" v-if="!item.send">
						<!-- 头像 -->
						<image class="avatar" :src="item.image">
							{{item.senderName}}
						</image>
						<!-- 文字内容 -->
						<view class="content left">
							{{item.msgContent}}
						</view>
					</view>
				</view>
			</view>
		</scroll-view>
		<!-- 底部消息发送栏 -->
		<!-- 用来占位，防止聊天消息被发送框遮挡 -->
		<view class="chat-bottom" :style="{height: `${inputHeight}rpx`}">
			<view class="send-msg" :style="{bottom:`${keyboardHeight - 60}rpx`}">
				<view class="uni-textarea">
					<textarea v-model="chatMsg" maxlength="300" confirm-type="send" @confirm="handleSend"
						placeholder="快来聊天吧~" :show-confirm-bar="false" :adjust-position="false" @linechange="sendHeight"
						@focus="focus" @blur="blur" auto-height></textarea>
				</view>
				<button @click="handleSend" class="send-btn">发送</button>
			</view>
		</view>
	</view>
</template>
<script>
	import {
		addHistoryRecord,
		queryHistoryRecord
	} from "../../utils/utils"

	export default {
		name: "chat",
		data() {
			return {
				//键盘高度
				keyboardHeight: 0,
				//底部消息发送高度
				bottomHeight: 0,
				//滚动距离
				scrollTop: 0,
				userId: '',
				//发送的消息
				chatMsg: "",
				msgList: [
					// {
					// 	botContent: "你好啊，很高兴你可以关注我，请问我有什么可以帮助你的吗？",
					// 	userContent: "",
					// 	image: "/static/common/unname1.jpeg"
					// },
					// {
					// 	botContent: "",
					// 	userContent: "你好呀，非常高兴认识你",
					// 	image: "/static/common/unname2.jpg"
					// },
				],
				cnt: 0,
				groupInfo: {},
			}
		},
		updated() {
			//页面更新时调用聊天消息定位到最底部
			this.scrollToBottom();
		},
		computed: {
			windowHeight() {
				return this.rpxTopx(uni.getSystemInfoSync().windowHeight)
			},
			// 键盘弹起来的高度+发送框高度
			inputHeight() {
				return this.bottomHeight + this.keyboardHeight
			}
		},
		onLoad(option) {
			uni.onKeyboardHeightChange(res => {
				//这里正常来讲代码直接写
				//this.keyboardHeight=this.rpxTopx(res.height)就行了
				//但是之前界面ui设计聊天框的高度有点高,为了不让键盘和聊天输入框之间距离差太大所以我改动了一下。
				this.keyboardHeight = this.rpxTopx(res.height)
				if (this.keyboardHeight < 0) this.keyboardHeight = 0;
			})

			//加载传递过来的数据
			let that = this;
			this.groupInfo = JSON.parse(option.groupInfo);
			let userId = uni.getStorageSync("login:userid");
			uni.$on("onSocketMessage", (res) => {
				//接收到消息
				let data = JSON.parse(res.data);
				if (data.groupId == that.groupInfo.groupId) {

					//判断是自己发送还是他人发送
					if (data.senderId == userId) {
						that.saveLocalChat(data, true);
					} else {
						that.saveLocalChat(data, false);
					}

				} else {
					that.cnt++;
				}
			})

			//加载消息
			//查询用户的会话信息,默认查20条
			queryHistoryRecord(0, 20, 2, that.groupInfo.groupId)
				.then(data => {
					console.log("查询到的数据", data);
					data.sort((a, b) => a.msgId - b.msgId);
					this.msgList = data;
				})


		},
		onUnload() {
			// uni.offKeyboardHeightChange()
		},
		methods: {
			goback() {
				uni.navigateBack();
			},
			focus() {
				this.scrollToBottom()
			},
			blur() {
				this.scrollToBottom()
			},
			// px转换成rpx
			rpxTopx(px) {
				let deviceWidth = uni.getSystemInfoSync().windowWidth
				let rpx = (750 / deviceWidth) * Number(px)
				return Math.floor(rpx)
			},
			// 监视聊天发送栏高度
			sendHeight() {
				setTimeout(() => {
					let query = uni.createSelectorQuery();
					query.select('.send-msg').boundingClientRect()
					query.exec(res => {
						this.bottomHeight = this.rpxTopx(res[0].height)
					})
				}, 10)
			},
			// 滚动至聊天底部
			scrollToBottom(e) {
				setTimeout(() => {
					let query = uni.createSelectorQuery().in(this);
					query.select('#scrollview').boundingClientRect();
					query.select('#msglistview').boundingClientRect();
					query.exec((res) => {
						if (res[1].height > res[0].height) {
							this.scrollTop = this.rpxTopx(res[1].height - res[0].height)
						}
					})
				}, 15)
			},

			saveLocalChat(msg, send) {
				this.saveRealMsgRecord(msg, send);
			},

			saveRealMsgRecord(msg, send) {
				let obj = {
					...msg,
					send: send,
					image: "/static/common/unname2.jpg"
				}
				let msgId = msg.msgId;
				//这里需要处理 重复问题，乱序问题
				//判断消息重复
				let hasArr = this.msgList.filter(item => item.msgId == msg.msgId);
				if (hasArr.length > 0) {
					return;
				}

				//消息乱序
				let len = this.msgList.length;

				if (len >= 1 && msgId > this.msgList[0].msgId && msgId < this.msgList[len - 1].msgId) {
					//插入到指定位置
					let cacheMsgList = this.msgList;
					let instInx = -1;
					for (var i = 0; i < cacheMsgList.length; i++) {
						let msgItem = cacheMsgList[i];
						if (msgId > msgItem.msgId) {
							//大于
							instInx = i;
							break;
						}
					}
					//移动数据
					for (var i = cacheMsgList.length; i > instInx; i--) {
						cacheMsgList[i] = cacheMsgList[i - 1];
					}
					cacheMsgList[instInx] = msg;
					//保存
					this.msgList = cacheMsgList;
					console.log("------插入", this.msgList);
				} else if (len >= 1 && msgId < this.msgList[0].msgId) {
					//不处理
				} else {
					//默认情况直接插入
					this.msgList.push(obj);
				}

				this.scrollToBottom();

				//将数据保存到数据库中
				//数据库不用处理重复和乱序的问题
				//重复：相同id只会更新
				//乱序：查询的数据会按照msgId排序
				addHistoryRecord(obj);

			},



			// 发送消息
			handleSend() {
				//如果消息不为空
				if (!this.chatMsg || !/^\s+$/.test(this.chatMsg)) {
					// let obj = {
					// 	botContent: "",
					// 	userContent: this.chatMsg,
					// 	image: "/static/common/unname2.jpg"
					// }
					// this.msgList.push(obj);
					// this.chatMsg = '';
					// this.scrollToBottom()
				} else {
					this.$modal.showToast('不能发送空白消息')
					return;
				}

				let userId = uni.getStorageSync("login:userid");
				let curUser = uni.getStorageSync("login:userinfo");
				//发送消息
				let msg = {
					"msgContent": this.chatMsg,
					"type": 2,
					"groupId": this.groupInfo.groupId,
					"msgType": 1,
					"msgStatus": 1,
					"senderId": userId,
					"senderName": JSON.parse(curUser).username,
					"groupName": this.groupInfo.groupName,
				};
				//
				let that = this;
				console.log("发送消息", msg);
				uni.sendSocketMessage({
					data: JSON.stringify(msg),
					success() {
						console.log("发送消息成功");
						that.chatMsg = '';
						// that.saveLocalChat(msg, true);
					}
				});
			},
		},
		onUnload() {
			uni.$off("onSocketMessage");
		}
	}
</script>
<style lang="scss" scoped>
	$chatContentbgc: #C2DCFF;
	$sendBtnbgc: #4F7DF5;

	view,
	button,
	text,
	input,
	textarea {
		margin: 0;
		padding: 0;
		box-sizing: border-box;
	}

	/* 聊天消息 */
	.chat {
		.topTabbar {
			width: 100%;
			height: 90rpx;
			line-height: 90rpx;
			display: flex;
			// margin-top: 80rpx;
			justify-content: space-between;

			.icon {
				margin-left: 20rpx;
			}

			.text {
				margin: auto;
				font-size: 16px;
				font-weight: 700;
			}

			.button {
				width: 10%;
				margin: auto 20rpx auto 0rpx;
			}
		}

		.scroll-view {
			::-webkit-scrollbar {
				display: none;
				width: 0 !important;
				height: 0 !important;
				-webkit-appearance: none;
				background: transparent;
				color: transparent;
			}

			// background-color: orange;
			background-color: #F6F6F6;

			.chat-body {
				display: flex;
				flex-direction: column;
				padding-top: 23rpx;
				// background-color:skyblue;

				.self {
					justify-content: flex-end;
				}

				.item {
					display: flex;
					padding: 23rpx 30rpx;
					// background-color: greenyellow;

					.right {
						background-color: $chatContentbgc;
					}

					.left {
						background-color: #FFFFFF;
					}

					// 聊天消息的三角形
					.right::after {
						position: absolute;
						display: inline-block;
						content: '';
						width: 0;
						height: 0;
						left: 100%;
						top: 10px;
						border: 12rpx solid transparent;
						border-left: 12rpx solid $chatContentbgc;
					}

					.left::after {
						position: absolute;
						display: inline-block;
						content: '';
						width: 0;
						height: 0;
						top: 10px;
						right: 100%;
						border: 12rpx solid transparent;
						border-right: 12rpx solid #FFFFFF;
					}

					.content {
						position: relative;
						max-width: 486rpx;
						border-radius: 8rpx;
						word-wrap: break-word;
						padding: 24rpx 24rpx;
						margin: 0 24rpx;
						border-radius: 5px;
						font-size: 32rpx;
						font-family: PingFang SC;
						font-weight: 500;
						color: #333333;
						line-height: 42rpx;
					}

					.avatar {
						display: flex;
						justify-content: center;
						width: 78rpx;
						height: 78rpx;
						background: $sendBtnbgc;
						border-radius: 50rpx;
						overflow: hidden;

						image {
							align-self: center;
						}

					}
				}
			}
		}

		/* 底部聊天发送栏 */
		.chat-bottom {
			width: 100%;
			height: 100rpx;
			background: #F4F5F7;
			transition: all 0.1s ease;

			.send-msg {
				display: flex;
				align-items: flex-end;
				padding: 16rpx 30rpx;
				width: 100%;
				min-height: 177rpx;
				position: fixed;
				bottom: 0;
				background: #fff;
				transition: all 0.1s ease;
			}

			.uni-textarea {
				padding-bottom: 70rpx;

				textarea {
					width: 537rpx;
					min-height: 75rpx;
					max-height: 500rpx;
					background: #f1f1f1;
					border-radius: 40rpx;
					font-size: 32rpx;
					font-family: PingFang SC;
					color: #333333;
					line-height: 74rpx;
					padding: 5rpx 8rpx;
					text-indent: 30rpx;
				}
			}

			.send-btn {
				display: flex;
				align-items: center;
				justify-content: center;
				margin-bottom: 76rpx;
				margin-left: 25rpx;
				width: 120rpx;
				height: 75rpx;
				background: #ed5a65;
				border-radius: 50rpx;
				font-size: 28rpx;
				font-family: PingFang SC;
				font-weight: 500;
				color: #FFFFFF;
				line-height: 28rpx;
			}
		}
	}
</style>